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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64ec81481e9a8d7128d1983ef94dff96f74c932db11b602cd8857e545a6f3888' 
  AND token = 'jySSi2m2Ur8M/E71UWo6Se/FtJscPkdN6qEQY7fv9Wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}